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authorOtavio Salvador <otavio@ossystems.com.br>2013-01-11 03:19:18 +0000
committerStefano Babic <sbabic@denx.de>2013-01-21 12:05:22 +0100
commit30af6c0bca30e79da560561f590b21677fa9f418 (patch)
tree690ccea16ec31e4ae546137412ac601c9390db75 /arch/arm/cpu/arm926ejs/mxs
parent7788bf067db6710dd5df76d420c7033087642173 (diff)
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mxs: Fix the memory init for MX23
The memory init is slightly different on MX23, thus split the memory init for mx23 and mx28 into different functions. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs')
-rw-r--r--arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c93
1 files changed, 78 insertions, 15 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index 9d05f83..5944dd2 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -128,13 +128,20 @@ static void mxs_mem_init_clock(void)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
+#if defined(CONFIG_MX23)
+ /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
+ const unsigned char divider = 33;
+#elif defined(CONFIG_MX28)
+ /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
+ const unsigned char divider = 21;
+#endif
/* Gate EMI clock */
writeb(CLKCTRL_FRAC_CLKGATE,
&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
- /* Set fractional divider for ref_emi to 480 * 18 / 21 = 411MHz */
- writeb(CLKCTRL_FRAC_CLKGATE | (21 & CLKCTRL_FRAC_FRAC_MASK),
+ /* Set fractional divider for ref_emi */
+ writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
/* Ungate EMI clock */
@@ -217,10 +224,60 @@ uint32_t mxs_mem_get_size(void)
return sz;
}
-void mxs_mem_init(void)
+#ifdef CONFIG_MX23
+static void mx23_mem_setup_vddmem(void)
+{
+ struct mxs_power_regs *power_regs =
+ (struct mxs_power_regs *)MXS_POWER_BASE;
+
+ writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
+ POWER_VDDMEMCTRL_ENABLE_ILIMIT |
+ POWER_VDDMEMCTRL_ENABLE_LINREG |
+ POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
+ &power_regs->hw_power_vddmemctrl);
+
+ early_delay(10000);
+
+ writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
+ POWER_VDDMEMCTRL_ENABLE_LINREG,
+ &power_regs->hw_power_vddmemctrl);
+}
+
+static void mx23_mem_init(void)
+{
+ mx23_mem_setup_vddmem();
+
+ /*
+ * Configure the DRAM registers
+ */
+
+ /* Clear START and SREFRESH bit from DRAM_CTL8 */
+ clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
+
+ initialize_dram_values();
+
+ /* Set START bit in DRAM_CTL16 */
+ setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
+
+ clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
+ early_delay(20000);
+
+ /* Adjust EMI port priority. */
+ clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
+ early_delay(20000);
+
+ setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
+ setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
+
+ /* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
+ while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
+ ;
+}
+#endif
+
+#ifdef CONFIG_MX28
+static void mx28_mem_init(void)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
struct mxs_pinctrl_regs *pinctrl_regs =
(struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
@@ -228,16 +285,6 @@ void mxs_mem_init(void)
writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
- /* Power up PLL0 */
- writel(CLKCTRL_PLL0CTRL0_POWER,
- &clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
-
- early_delay(11000);
-
- mxs_mem_init_clock();
-
- mxs_mem_setup_vdda();
-
/*
* Configure the DRAM registers
*/
@@ -256,6 +303,22 @@ void mxs_mem_init(void)
/* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
;
+}
+#endif
+
+void mxs_mem_init(void)
+{
+ early_delay(11000);
+
+ mxs_mem_init_clock();
+
+ mxs_mem_setup_vdda();
+
+#if defined(CONFIG_MX23)
+ mx23_mem_init();
+#elif defined(CONFIG_MX28)
+ mx28_mem_init();
+#endif
early_delay(10000);